MXPA00012282A - Power transmission belt - Google Patents

Abstract

An endless power transmission belt (20) having (1) a tension section (21);(2) a cushion section (23);and (3) a load-carrying section (25) disposed between said tension section and cushion section;and the belt containing an elastomeric composition comprising (a) 100 parts of a rubber derived from (i) 50 to 100 parts by weight of an ethylene alpha olefin elastomer;and (ii) 0 to 50 parts by weight of a rubber selected from the group consisting of silicone rubber, polychloroprene, epichlorohydrin, acrylonitrile rubber, hydrogenated acrylonitrile rubber, zinc salts of unsaturated carboxylic acid ester grafted hydrogenated nitrile butadiene-elastomer, natural rubber, styrene-butadiene rubber, 1,4-trans-polybutadiene, ethylene-vinylacetate copolymer, ethylene methacrylate copolymers and terpolymers, chlorinated polyethylene, chlorosulfonated polyethylene, alkylated chloro sulfonated polyethylene, trans-polyoctenamer, polyacrylic rubber, and mixtures thereof;(b) from 1 to 30 parts by weight per 100 parts by weight of total rubber (phr) of a polybutadiene adduct of maleic acid anhydride.

Description

POWER TRANSMISSION BAND BACKGROUND OF THE INVENTION Recent developments in the automotive industry have resulted in higher engine performance in a more compact engine compartment. Therefore, the power transmission bands in these motors have required operating under high load, at higher voltages and at elevated temperatures. This environment demands a high quality band, able to withstand these severe conditions as well as consumer demand for longer duration bands. Therefore, there is a need for new and improved bands to meet the demand in the industry.

SUMMARY OF THE INVENTION The present invention relates to a power transmission band, which is characterized by a rubber composition containing a mixture of an ethylene-alpha-olefin elastomer and a polybutadiene adduct of maleic anhydride. The Figures The accompanying figures show embodiments of this invention, in which: Figure 1 is a fragmentary perspective view, illustrating a modality of an endless band of transmission of patency, according to this invention; and Figure 2 is a fragmentary perspective view, illustrating an embodiment of the power transmission endless band, according to this invention.

Detailed Description of the Invention An endless band of power transmission is described, which has: (1) a section of tension; (2) a cushion section; and (3) a load bearing section disposed between the tension section and the cushion section, this band contains an elastomeric composition, comprising a) 100 parts of a rubber derived from: (i) 50 to 100 parts by weight of an ethylene and alpha-olefin elastomer; and (ii) from 0 to 50 parts by weight of a rubber, selected from the group consisting of silicone rubber, polychloroprene, epichlodrin, acrylonitrile rubber, hydrogenated acrylonitrile rubber, zinc salts of a butadiene elastomer and hydrogenated nitrile, grafted with an unsaturated carboxylic acid ester, natural rubber, styrene-butadiene rubber, 1,4-trans-polybutadiene, copolymer of ethylene and vinyl acetate, copolymers and terpolymers of methacrylate and ethylene, chlorinated polyethylene, chlorosulfonated polyethylene, alkylated chlorosulfonated polyethylene , trans-polyoctenamer, polyacrylic rubber, and mixtures thereof, b) from 1 to 30 parts by weight, per 100 parts by weight of total rubber (per) of a polybutadiene adduct of maleic acid anhydride.

The present invention relates to a new and improved power transmission band. The power transmission band of the present invention can be incorporated in accordance with the three conventional types of power transmission band designs. In the first design, the cushion section is a cushion section reinforced with ground short fibers, coated with cloth, or molded rubber with a short fiber cushion section coated with fluff. In the second design, the cushion section has a trimmed edge or a band without fabric lining, which has fabric folds covered with rubber or folds of fiber-reinforced material, such as the base material. The third design is a band with textile lining, which is wound with one or more textile fabric wraps. Reference is now made to Figure 1 of the drawings, which illustrates an endless power transmission band structure, or band of this invention, which is generally designated with the reference number 10. The band 20 is particularly adapted for to be used in grooved pulleys, associated according to the techniques known in the art. The band is particularly suitable for use in center cut transmissions, exercise equipment, automobile transmissions, farm equipment, so-called torsion detecting transmissions, application where variable band voltage shock loads are imposed on the band, applications where the band is operated at variable speeds, applications where the band is spring loaded to control its tension, and the like. The band 20 comprises a tension section 21, a cushion section 23 and a load carrying section 25, disposed between the tension section 21 and the cushion section 23. The band 20 may optionally have an internal fold or layer 27 of internal fabric, adhered to the transmission surface 28 and three ribs 29 or V, which are covered with fabric. The band 20 of Figure 1 has a tissue backing 30. This fabric backing 30 may be a bidirectional, non-woven, knitted or knitted fabric. This fabric backing layer 30 may be friction, submerged, coated or laminated. According to the band of Figure 1, the fabric covering layer 27 can be made of a bidirectional, non-woven, knitted or knitted fabric. The preferred fabric layer 27 is nonwoven. The fabrics to be used in the coating layer 27 can be made of conventional materials, including nylon (such as nylon 4.6, nylon 6.6 and nylon 6), polyester / rayon, cotton, cotton / rayon, polyester, cotton / polyester, nylon / polyester, cotton / nylon, Lycra ™ (segmented polyurethane), aramid, rayon and the like. Preferably, the fabric is made of polyester / rayon. The load bearing section 25 has a load carrying element in the form of cords or filaments 31, which are suitably embedded in an elastomeric cushion or matrix 33, according to techniques that are well known in the art. The cords 31 or filaments can be obtained from any suitable material, known and used in the art. Representative examples of such materials include aramides, glass fibers, nylon, polyester, cotton, steel, carbon fibers and polybenzoxazole. The pulse surface 28 of the band 20 of Figure 1 has multiple V-grooves. According to other embodiments, it is considered here that the bands of the present invention also include those bands where the pulse surface of the band can be flat , V-groove simple and synchronous. Representative examples of synchronous include bands having trapezoidal or curvilinear teeth. The design of the tooth may have a helical offset tooth design, such as is shown in U.S. Patent Nos. 5,209,705 and 5,421,789. The band 20 of Figure 1 has a pulse surface 28. However, it is considered here that the band can have two pulse surfaces (not shown), such as in a double-sided band. In such a case, one or both of the driving surfaces may be of fabric, as described herein. Preferably, the band 20 has a pulse surface. The elastomeric compositions for use in the tension section 21 and the cushion section 22 may be the same or different. The elastomeric composition, for use in the tension section 21 and / or the cushion section 22, contains 100 parts of an elastomer, of which 50 to 100 parts by weight is an elastomer of ethylene and alpha-olefin. Preferably, from 60 to 100 parts by weight is an elastomer of ethylene and alpha-olefin. This ethylene and alpha-olefin elastomer includes copolymers having ethylene and propylene units (EPM), ethylene and butene units, ethylene and pentene units or ethylene and octene units (EOM) and terpolymers composed of ethylene units and propylene and an unsaturated component (EPDM), as well as their mixtures. According to the unsaturated component of EPDM, any suitable non-conjugated diene can be used, which includes, for example, 1,4-hexadiene, dicyclopentadiene or ethylidene norbornene (ENB). The preferred ethylene and alphaolefin elastomer in the present invention contains about 35 to 80 weight percent of ethylene units, about 65 to 25 weight percent of propylene or octene units and 0 to 10 percent by weight in weight of the unsaturated component. In a more preferred mode, the ethylene and alpha-olefin elastomer contains from about 50 to 70 weight percent of ethylene units and, in an especially preferred embodiment, the ethylene and alpha-olefin elastomer contains about 55 to 65 percent units of ethylene. The especially preferred ethylene and alpha-olefin elastomer is EPDM.

The remaining rubber, from 0 to 50 parts by weight, of the elastomer composition is selected from the group consisting of silicone rubber, polychloroprene, epichlorohydrin, acrylonitrile rubber, hydrogenated acrylonitrile rubber, zinc salts of a butadiene elastomer and hydrogenated nitrile, grafted with unsaturated carboxylic acid ester, natural rubber, synthetic polyisoprene, styrene-butadiene rubber, 1,4-trans-polybutadiene, copolymer of ethylene and vinyl acetate, copolymers and terpolymers of methacrylate and ethylene, chlorinated polyethylene, chlorosulfonated polyethylene, alkylated chlorosulfonated polyethylene, trans-polyoctenamer, polyacrylic rubber, and mixtures thereof. Preferably, from 0 to 40 parts by weight of 100 total parts by weight of the elastomer is one or more of the rubbers listed above. Preferably the rubber is ethylene and vinyl acetate. The elastomeric composition contains from 1 to 30 per part of the polybutadiene adduct of maleic acid anhydride. Preferably, they are present from 5 to 15 per. The polybutadiene may be a random polybutadiene polymer, containing both 1.4 and 1,2-butadiene units. The amount of the 1,2-vinyl bands can vary from 15 to 90 percent by weight. Preferably, 20 to 70 weight percent of the 1,2-vinyl bands are present. Preferred adducts are maleic adduct resins, sold by Ricon Resins Ine of Grand Junction, Colorado, under the trade name Ricobond ™. Specific examples include Ricobond 1731 (molecular weight, Mn, of about 6400, and a viscosity of about 500 poses at 45 ° C). Ricobond 203 (molecular weight, Mn, of about 7500, and a viscosity of about 100 poises, at 45 ° C) and Ricobond 1756 (molecular weight, Mn, of about 3000 and a viscosity of about 1400 poises, at 55 ° C ). According to a preferred embodiment, the rubber composition containing a mixture of ethylene and alpha-olefin elastomer, and a polybutadiene adduct of maleic anhydride, is used in the cushioning section of the band. They can also be present in the composition conventional carbon blacks. Such carbon blacks are used in conventional amounts, ranging from 5 to 250 per cent. Preferably, the carbon blacks are used in an amount ranging from 20 to 100 per cent. Representative examples of carbon blacks that may be used include those known by their designations ASTM N110, N121, N242, N293, N299, S315, N326, N330, M332, N339, N347, N351, N358, N375, M550, N582, N630, N624, N650, N660, N683, N754, N762, N907, N908, N990 and N991.

A conventional acid acceptor may be present in the mixture of the ethylene and alpha-olefin elastomer and the polybutadiene adduct of the maleic anhydride. Acid acceptors are known to improve the heat resistance of rubber. Representative acid acceptors include pentaerythritol, magnesium oxide, litharge (PbO), red lead (Pb304), dital / basic lead phthalate), trimal (tribasic lead maleate), epoxy resins, epoxidized oils, calcium hydroxide (Ca (OH) 2), calcium aluminate hexahydrate, magnesium hydratalate, a solid solution of magnesium oxide and aluminum oxide, and mixtures thereof. This solid solution of magnesium oxide and aluminum oxide is generally represented by Mgo.7ALo.3O1.15. Representative of the suitable solid solutions of magnesium oxide and aluminum oxide are KW-2000 and KW-2100, both commercially available from Kyowa Kagaku Kogyo Co., Ltd., and the like. If used, the amount of acid acceptor that is used ranges from about 1 to 50 per, preferably about 2 to 20 per. Those skilled in the art will readily understand that the rubber composition could be obtained by methods generally known in the rubber composition art, such as mixing the various constituent rubbers with various additive materials., commonly used, such as, for example, curing aids and process additives, such as oils, resins that include tackifying resins, and plasticizers, fillers, pigments, fatty acids, waxes, antioxidants and antiozonants. The additives, mentioned above, are commonly selected and used in conventional amounts. Typical amounts of the tackifying resins, if used, comprise about 0.5 to 10 per, usually about 1 to 5 per. Typical amounts of process aids comprise approximately 1 to 50 per. Such processing aids may include, for example, polyethylene glycol, naphthenic and / or paraffinic process oils. Typical amounts of antioxidants comprise approximately 1 to 5 per. A representative antioxidant is trimethyl-dihydroquinoline. Typical amounts of fatty acids, if used, which may include stearic acid, comprise about 0.5 to 3 per. Typical amounts of waxes comprise approximately 1 to 5 per. Often, microcrystalline and carnauba waxes are used. Typical amounts of plasticizers, if used, range from 1 to 100 per. Representative examples of these plasticizers include dioctyl sebacate, chlorinated paraffins, and the like. Various non-carbon fillers and reinforcing agents can be added to increase the strength and integrity of the rubber composition to obtain the power transmission band of the present invention. An example of a reinforcing agent is silica. The silica can be used in the present composition in amounts of about 0 to 80 parts and preferably 10 to 20 parts by weight, based on 100 parts of rubber. The elastomer composition may also have fibers or fluff distributed therethrough. This is particularly the case, as shown in Figure 2, when the elastomer is used in the cushioning section of the band. The fibers or fluff to be distributed through the elastomer mixture may be of any suitable material and are preferably non-metallic fibers, such as cotton or fibers obtained from a suitable synthetic material, such as kevlar, nylon, polyester , PTFE, glass fibers, and the like. Each fiber can have a diameter that varies between 0.025 and 1.3 mm, and a length that varies from 0.025 to 12.5 mm. The fibers can be used in an amount ranging from 5 to 50 per. In addition to the above, inorganic solid lubricants may be present in the mixture of the ethylene and alpha-olefin elastomer and the polybutadiene adduct. Representative examples of such lubricants include molybdenum disulfide, PTFE, molybdenum disodide, graphite, antimony trioxide, tungsten disulfide, talc, mica, tungsten diselenide, and mixtures thereof. The amount of each solid inorganic lubricant, if used, will generally vary from 1 to 25 per. An interlacing reaction of free radial is used to cure the rubber-containing composition in the band. Well-known classes of peroxides that can be used include diacyl peroxides, peroxyesters, dialkyl peroxides and peroxycetals. Specific examples include dicumyl peroxide, n-butyl-4,4-di (t-butylperoxy) valerate, 1,1-di (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-diol. (t-butylperoxy) -cyclohexane, 1,1-di (t-amylperoxy) -cyclohexane, 3,3-di (t-butylperoxy) ethyl butyrate, 3, 3-di (t-amylperoxy) ethyl butyrate, , 5-dimethyl-2, 5-di (t-butylperoxy) hexane, t-butyl-cumyl peroxide, a ,, a'-bis (t-butylperoxy) diisopropylbenzene, di-t-butyl peroxide, 2, 5 dimethyl-2, 5-di (t-butylperoxy) hexin-3, t-butyl perbenzoate, 4-methyl-4-t-butylperoxy-2-pentanone and mixtures thereof. The preferred peroxide is a, a'-bis (t-butylperoxy) diisopropylbenzene. Typical amounts of peroxide vary from 1 to 12 per (based on the active parts of the peroxide). Preferably, the amount of the peroxide varies from 2 to 6 per. Co-entanglement agents can be added to the composition. Representative examples of such coagents include triallyl cyanurate, triallyl isocyanurate, triallyl phosphate, triallyl trimellitate, diallylide pentaerythritol, diallyl terephthalate, tetra-allyl oxyethane, triallyl citrate, acetyl triallyl-oxyethane, acetyl triallyl -citrate, acrylates, di-, tri-, tetra- and penta-functional methacrylates, n, n'-m-phenylene-dimaleimide, 1, 2-cis-polybutadiene and mixtures thereof. Typical amounts of such co-agents vary from 1 to 30 per. Preferred ranges of co-agents include from 2 to 10 per. The mixture of the rubber composition can be achieved by methods known to those skilled in the rubber mixing art. For example, the ingredients may be mixed in one step, but are typically mixed in at least two stages, that is, at least one non-productive stage, followed by a productive mixing step. The final curing agents, which include the vulcanizing agents, are typically mixed in the final stage, which is conventionally referred to as the "productive" mixing step, in which the mixture typically occurs at a temperature, or final temperature lower than that (s) temperature (s) of the mixture that precede one or more non-productive mixing stages. The curing of the rubber composition for use in the band is generally carried out at conventional temperatures, which vary from about 160 to 190 ° C. Preferably, curing is conducted at temperatures ranging from about 170 to 180 ° C.

The surface of the fabric 27, if used, on the impulse surface, can be covered with a fluff 35 of short fibers, by means of an adhesive, to directly adhere the fluff 35 to the cloth 27. The fluff 35 short, for use in this invention, is characterized by a length interval of 0.12 to 9.6 mm and a denier (grams per 9000 meters) of 0.5 to 50. Preferably, the length (measured in the lengthwise direction) varies from 0.25 to 6 mm and the denier varies from 0.8 to 25. Most of the preferred eraser has a length of 0.5 to 3 mm and a denier of 1 to 3. The eraser 35 of short fibers is uniformly distributed directly on the surface of the pulse surface 28 of the power transmission band 20. In the embodiment shown in Figure 1, the fluff is not dispersed in the elastomer of the compression section 23, but rather is separated from the elastomer in the compression section 23 by the cloth 27. This eraser of short fibers can be derived from cotton, carbon fibers, rayon, acrylic, Telfon ™ (polytetrafluoroethylene), nylon, polyester, aromatic polyamide (aramid), glass fibers and their mixtures. The fluff 35 can be produced by means known to those skilled in the art, such as reducing the length of a fiber mass and shortening, by cutting or shredding. The crushed fibers are then sorted to remove excessively long fibers.

There are many types of adhesives based on water and solvent, which can be used to adhere the lint to the surface of the fabric. The particular adhesive used may vary. A conventional adhesive that can be used is known in the art as the RFL (resorcinol-formaldehyde-latex) adhesive. The RFL adhesives comprise a polymer latex that can be based on natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber (NBR), hydrogenated acrylonitrile-butadiene rubber (ABR) and vinyl pyridine. An optional ingredient to the RFL is an isocyanate compound. Additional examples of conventional adhesives are the resin emulsions sold by BF Goodrich, including polyvinyl acetate, polyacrylic, polyvinyl chloride and polyurethane. The cement (organic) solutions of the polymers can be used as an adhesive. Representative polymers include natural rubber, polychloroprene, acrylonitrile-butadiene copolymers, polyisoprene, zinc salts of hydrogenated butadiene and nitrile elastomers, grafted with unsaturated carboxylic esters, polybutadiene, EPDM, hydrogenated copolymers of acrylonitrile and butadiene, polyurethane and ethylene elastomers -acrylic . The adhesive is first applied to the fabric 27 and the eraser 35 is then applied. The adhesive can be applied to the fabric or before or after being adhered to the band compression section 23. Preferably, the adhesive and fluff are first applied to the cloth 27 and then the wiped cloth 27 is applied to the band 20. There are many methods available for applying the adhesives to the fluff. In the roll-to-roll application, the adhesive can be applied with knife-type, reverse-roller or roller-on-platform coatings. The engraving rollers, spray applicators and rotary screen printers can also be used. Other methods of applying adhesive to the lint include silk screen, dip, brush and spray. The thickness of the adhesive layer may vary. Generally speaking, the thickness of the adhesive can vary from about 0.05 to 1 mm. Preferably, the thickness of the adhesive will vary from 0.05 to 0.4 mm. The eraser 35 of short fibers can be applied to the treated fabric with adhesive in a number of media and then the erased fabric is applied to an uncured strip. This eraser can be applied to the surface coated with adhesive or mechanically or electrostatically or by means of a combination of both techniques. The mechanical application of fluff can further be divided into air blowing methods and shaker bar methods. The electrostatic eraser application incorporates a pneumatic process to propel the fibers to a surface on a wind screen. The shaking bar method involves the passage of the adhesive treated fabric over a series of polygonal rollers that rotate rapidly to vibrate the substrate, The vibration is used to drive the fibers on the adhesive. The fibers can be fed to the substrate by gravity from a flux module. The mechanical application of mechanically erased by wind blowing, uses a current of air to deliver the eraser to the fabric treated with adhesive. The electrostatic application of the fluff is a known technique that uses a static electricity field to guide and promote its perpendicular alignment. This technique is recommended with longer fibers,. In the electrostatic technique, the substrate coated with adhesive passes between the potentials of a high-voltage electrostatic field. An electrode is used to give a charge to the fluff. The charged fibers become aligned with the electric field force lines. The ground potential is formed by the substrate and / or the ground parts of the machine. The eraser is thus attracted to the adhesive, where it becomes embedded. By means of this method, the majority of the fibers that adhere to the adhesive-coated surface are perpendicular thereto. The wind blowing and electrostatic methods can be used simultaneously through the application of pneumatic / electrostatic fluff. By this method, an air stream containing the fibers is directed through a nozzle. At the outlet of the nozzle, a load orients the fibers according to the field lines. The short fiber eraser can be applied to the fabric of the band at a variety of levels. For example, the amount of fluff can vary from 0.05 to 1.0 kg / m2. Preferred levels vary from around 0.1 to 0.5 kg / m2. After applying the fiber fluff, the cloth with fluff can be cleaned by suction and the like. Next, the adhesive dries. Referring to Figure 2, an endless band 50 of power transmission is shown, according to another embodiment. Similar to the band 20 of Figure 1, the band 50 comprises a tension section 51, a cushion section 53 and a load carrying section 55 disposed between the tension section 51 and the cushion section 53. In contrast to band 20 of Figure 1, band 50 of Figure 2 does not have a fabric layer on the pulse surface. The band 50 of Figure 1 has a plurality of ribs 59 or V, and a cloth backing 60. The load carrying section 5 has a load-bearing element in the form of strands 61 or filaments, which are embedded in an elastomeric matrix 63. The elastomeric compound located in the cushioning section 53 is illustrated as being loaded with fibers 65. As you know the experts in the field,. the power transmission bands can be built on a drum device. First, the backing is applied to the drum as a sheet. Next, any tension section is applied as a sheet, followed by the spiral formation on the drum of the cord or tension members (load bearing section). Then, the cushion section is applied followed by the fabric. The assembled laminate or slab is then removed from the drum, placed in a mold and cured and cut in the bands, in a manner known to those skilled in the art. While presently exemplary embodiments of this invention and methods for practicing the same have been illustrated and described, it will be recognized that the invention can be incorporated and practiced variously in other ways, within the scope of the following claims.

Claims (10)

1. CLAIMS 1. A band without power transmission end, having: (1) a tension section, (2) a cushion section, and (3) a load carrying section, disposed between the tension section and the cushion section, this band contains an elastomeric composition, comprising a) 100 parts of a rubber derived from: (i) 50 to 100 parts by weight of an elastomer of ethylene and alpha-olefin, and (ii) from 0 to 50 parts by weight of a rubber, selected from the group consisting of silicone rubber, polychloroprene, epichlorohydrin, acrylonitrile rubber, hydrogenated acrylonitrile rubber, zinc salts of a butadiene elastomer and hydrogenated nitrile, grafted with an unsaturated carboxylic acid ester, natural rubber, styrene-butadiene rubber, 1,4-trans-polybutadiene, copolymer of ethylene and vinyl acetate, copolymers and terpolymers of methacrylate and ethylene, chlorinated polyethylene, chlorosulfonated polyethylene, alkylated chlorosulfonated polyethylene, trans-p olioctenmer, polyacrylic rubber, and mixtures thereof, b) from 1 to 30 parts by weight, per 100 parts by weight of total rubber (per) of a polybutadiene adduct of maleic acid anhydride.
2. 2. The endless power transmission band according to claim 1, characterized in that the polybutadiene adduct of maleic acid anhydride contains both 1,4 and 1,2-butadiene units, and the amount of double bonds of 1, 2-vinyl ranges from 15 to 90 weight percent of 1,2-vinyl.
3. 3. The endless power transmission band according to claim 1, characterized in that the elastomer composition of ethylene and alpha-olefin is an ethylene-propylene diene copolymer.
4. 4. The endless power transmission band according to claim 1, characterized in that the elastomer composition is in the cushion section of the band.
5. 5. The endless band of power transmission, according to claim 1, characterized in that the elastomer composition is in the section that carries load of the band.
6. 6. The endless band of power transmission, according to claim 1, characterized in that this band has at least one impulse surface, having a cloth-coated layer attached to the outer surface of the band.
7. 7. The power transmission band according to claim 1, characterized in that the fabric is selected from the group consisting of bidirectional, non-woven, knitted and knitted fabrics.
8. 8. The power transmission band according to claim 9, characterized in that the fabric is made of a material selected from the group consisting of nylon, polyester / rayon, cotton, cotton / rayon, polyester, cotton / polyester, nylon / polyester, cotton / nylon, segmented polyurethane, aramid and rayon.
9. 9. The power transmission band according to claim 1, characterized in that the pulse surface of the band is selected from the group consisting of flat surfaces, single V-grooved, multiple V-grooved and synchronous.
10. 10. The power transmission band according to claim 7, wherein the cushion section contains 5 to 50 per fibers distributed through the elastomer composition. SUMMARY OF THE INVENTION An endless band of power transmission, which comprises: (1) a voltage section; (2) a cushion section; and (3) a load bearing section, disposed between tension section and cushion section, the band contains an elastomeric composition, comprising a) 100 parts of a rubber derived from: (i) 50 to 100 parts by weight of a ethylene and alpha-olefin elastomer; and (ii) from 0 to 50 parts by weight of a hul selected from the group consisting of silicone rubber, polychloroprene, epichlorohydrin, acrylonitrile rubber, acrylonitrile rubber hydrogenated zinc salts of a butadiene elastomer and hydrogenated nitri, grafted with an ester of unsaturated carboxylic acid, natural rubber, styrene-butadiene rubber, 1, 4-trans-polybutadiene copolymer of ethylene and vinyl acetate copolymers and terpolymers of ethylene methacrylate, chlorinated polyethylene, polyethylene chlorosulfonated, polyethylene alkylated chlorosulforic, trans-polyoctenamer, polyacrylic rubber, and mixtures thereof, b) from 1 to 30 parts by weight, per 100 parts by weight of total rubber (per) of a polybutadiene adduct of maleic acid anhydride.